Stone-saw.



w. F. MEYERS.

STONE SAW.

APPLICATION FILED JUNE 20, 1912.

Patented Oct. 12, 1915.

mVv////4?////////////// w M m n m WITNESSES A TTORNEY UNITED STATESPATENT OFFICE.

WILLARD F. MEYERS, OF LONG ISLAND CITY, NEW YORK.

STONE-SAW.

Application filed June 20, 1912.

' To all whom it may concern:

Be it known that LVILLARD F. MnYnRs, a citizen of the United States.residing at Long Island City, in the county of Queens and State of XewYork, have invented certain new and useful Improvements in Stone- Saws,of which the following is a specification. reference being had thereinto the accompanying drawings, forming part thereof.

My invention relates generally to stone saws and relates particularly tothose having teeth consisting of masses of abrasive material, such as ofcarborundum or the like, and generally known as abrasive teeth. Greatdifficulty has been experienced in mounting these teeth on the sawblade. Provision must be made for the gradual wearing down of the teethand also the teeth must be firmly held in such manner as to avoidbreaking, as teeth of this nature are comparatively easily broken. It iscommon, either with or without the use of special holders, to set theseteeth in sockets or recesses in the edge of the saw blade in a mannersimilar'to that commonly employed in setting diamond teeth in place, butwhen abrasive teeth are set in this manner, only that portion of thetooth which projects beyond the edge of the blade can be used. the restand usually the larger portion of the toothbeing wasted. Moreover. theblade is likely itself to be worn in the effort to utilize as much aspossible of the material of the abrasive teeth, and it is also to benoted that usually the blades must be specially formed with specialtooth-holding recesses or sockets. The general objects of my inventionare inexpensiveness of manufacture, economy of maintenance in workingcondition, economy of time and labor.in use, a high degree ofeffectiveness of operation, and durability.

One of the more particular objects of my invention is to enable theapplication of my invention to ordinary saw blades, such as are commonlyemployed for holding diamond teeth, without necessitating any changes inthe blade, thereby obviating the manufacture of special blades and alsoenabling the invention to be applied to existing saw blades of thiscommon form, or enabling the same saw blade to be used interchangeablywith diamond teeth or with abrasive teeth, as the demands of Work to bedone may require.

Another object is to enable substantially the whole of an abrasive toothto be worn Specification of Letters Patent.

Patented Oct. 12,1915.

Serial No. 704,709.

away from its outer edge inward. and to do this without injury to theblade or the necessity of readjustment of the tooth.

Another object is to provide adequate clearance spaces for the escape ofloose particlcs or cuttings and for the circulation of a liquid.

Another object is, while accomplishing the preceding objects, to supportthe teeth in such manner that they will at all times be firmly held andin such manner as to prevent their breaking.

Other objects and advantages of my invention will hereinafter appear.

I shall now. describe the stone saw embodying my invention illustratedin the accompanying drawings and shall thereafter point out my inventionin claims.

Figure 1 is a side elevation of the upper part of a saw embodying myinvention. Fig. 2 is a vertical section of the same on a plane indicatedby the line 2-'2 of Fig. 1. Fig. 3 is a plan of what appears in Fig. 1.Fig. 4 is a plan or view looking toward the cutting edge of one of theabrasive teeth. Fig. 5 is-a side elevation of the same. Fig. 6 is a planor view looking toward the edge of one of the tooth-holding members orwedges. Fig. 7 is a side elevation of the same. Fig. 8 is a section,enlarged, on a plane indicated by the line 88 of Fig. 1 as viewed fromthe left.

The accompanying drawings illustrate an embodiment of my invention in astone saw of the circular rotary type, although it is to be understoodthat my invention could as well be embodied in a saw of the straight orreciprocating type. Abrasive teeth 1 of carborundum or other suitableabrasive material project from the edge of the blade 2 and are mountedon the periphery or outer edge of the blade 2, these teeth being shownas of greater thickness than the blade 2 and being arranged to projectsubstantially an equal distance at opposite sides thereof (Figs. 2 and3). The blade 2 is provided in its edge with sockets or recesses, suchas are commonly provided for the reception of the well known diamondteeth. In fact, a. saw blade of the construction commonly employed tohold diamond teeth may be employed in carrying out my inventioninvolving abrasive teeth, without any alteration whatsoever of the sawblade. The abrasive teeth 1 are positioned upon the peripheral edge ofthe blade 2 and are of a length at their bases to till the edge spacesbetween the sockets. The teeth 1 are tapered outward from their basesand from the sockets toward the cutting edges of the teeth and are shownas tapered throughout along straight lines. The bases and the cuttingedges of the teeth 1 are shown as curved on circles concentric with theblade 2, the curved bases of the teeth fitting closely against thecurved outer peripheral edge surface. of the blade, and the tapered endsof the teeth are chamfered and are shown as chainfered along straightlines to form transversely V-shaped ends for the teeth.

'looth-holding members or wedges 3 are arranged in alternate relationwith the ab '2 sive teeth 1. these wedges having shanks or anchorportions anchored or locked in the sockets between the teeth and havingtoothengaging portions projecting beyond the edge of the blade 2 andengaging the tapered portions of the teeth 1 to hold the teeth inposition on the blade The wedge-receiving recesses or sockets in theblade 2 have straight V-shaped chainfered side walls parallel or nearlyparallel to one another, so that the socket is substantiallyofflrectangular form, this being the usual form of recess or socket forcommonly receiving diamond teeth. The shanks of the tooth-holding wedges3 have edge walls conforming to the sockets so as to be capable offitting tightly therein, being provided with V-grooves for receiving thechamfered side walls of the sockets or recesses. The projectingtooth-holding por tion of any one of the wedges 3 is of bifurcatedconstruction providing two spaced flaring wedge prongs, the inner sidesof these prongs being slightly rounded and the outer sides havingtherein V-shaped grooves forming continuations of the correspondinggrooves in the shanks of these members, these V-grooved sides of theprongs engaging the correspondingly cha-mfered ends of the abrasiveteeth 1. The toothengaging wedge prongs are shown as terminating a shortdistance inward. from the cutting edges of the abrasive teeth 1 so as toinitially expose the cutting edges of theteeth, and, these prongs beingof metal, while the teeth 1 are composed of hard, gritty, abrasivematerial, the

prongs will wear down with the teeth, but slightly in advance thereof.so as to always expose the cutting edges of the teeth, and the teeth maybe used and will continue to expose effective cuttings edges untilsubstantially the whole bulk of'the teeth has been worn away.

The free spaces betwee .1 the Wedge prongs provide ample clearancethroughout the depth of the abrasive teethlfor the circulation of wateror other lubricant and for the escape of loose material or dust-likecuttings, and for the circulation of a liquid abrasive material, andthis clearance space is continued below the depth of the abrasive teethby the hollowing out of the tooth-holding wedges, so that they arethinner in their middle portions throughout their depth, being thinnerin such middle portions than the thickness of the blade 2. Thisconstruction, coupled with the fact that the teeth project laterallybeyond the blades, provides ample clearance space for liquid circulationand the escape of loose particles, and brovides much more clearancespace than is commonly provided merely by having the teeth thicker thanhe blade.

To assure that the abrasive teeth 1 shall be firmly gripped and held byastrong wedging action. the shanks of the wedges 3 do not extend quiteto the bottoms of the wedge-receiving sockets or recesses in the blade(Figs. l and 2) and the locking means.

provided for holding the wedges 3 in these sockets are adapted to firmlyand strongly draw the tooth-holding wedges 3 inward.

For this purpose, wedge-shaped locking rivets 4 are provided, which maybe the usual round rivets. I prefer, however, to employ locking rivetssuch as are shown, of substantially rectangular cross-section andtapered on two opposite sides, cooperating notches being provided in theblade 2 and in the shanks of the tooth-holding wedges 3. these twonotches forming a rectangular rivet-receiving opening, which is disposedat an oblique angle to the meeting faces of the shank of the wedge 3 andof the adjacent wall of the wedge-receiving socket in the blade 2. Thetapered sides of the ,locking rivets 4 engage the outer inclined wall ofthe notch in the blade 2 and the inner inclined wall of the cooperatingnotch in the shank of the tooth-holding wedge 3, so that, as the lockingrivets 4 are driven into place, they draw the tooth-holding wedges 3inward into firm wedging contact with the abrasive teeth 1. In adirection transverse to its wedging action, each wedge rivet 4: fitsloosely and with some free space in the rivet-receiving opening formedby the above described cooperating notches. thereby permitting theabrasive teeth 1 to be wedged in place without hindranceof the wedgingand locking rivets 4 to the tooth-gripping movement of the tooth-holdingwedges 3. After the locking rivets s1 have been firmly driven in, theymay be locked in place by slightly upsetting their opposite ends, asappears in Fig 8. Should the heads of these rivets 4 project somewhat,no harm can result. as the thickness of the abrasive teeth 1 over thatof the blade 2 provides ample clearance in the kerf cut by the saw. Twowedge rivets 4 are employed for each tooth-holding wedge 3 (Fig. 1).

As a means for holding the abrasive teeth in place when they have beenworn down to such thinness that their tensile strength may not besuflicient. to hold them together. I provide these teeth withreinforcing projections entering recesses in the edge of the blade.'lhese reinforcements may be in the form of anchors locking the teeth tothe blade between the tooth-holding wedges. As shown. one of theseanchors 5 is provided at the middle of each abrasive tooth. and it is anadhesive anchor consisting of a. mass of material which will firmlyadhere to the abrasive tooth and which fills a dovetailed notch in theedge of the blade and is thus held to the blade by reason of its shape.

It is to be noted that each tooth-holding wedge 3. between two teeth.acts to press against and grip these two adjacent teeth,

. and that each tooth 1 is gripped and held at its opposite tapered endsby two of the tooth-holding wedges 3. The abrasive teeth 1 and thetooth-holding wedges 3 will be worn down together and will be worn outat substantially the same time. and, there-. fore. all of the abrasiveteeth 1 and toothholding wedges 3 may be renewed at a single operation.

It is obvious that various modifications may be made in the constructionshown in the drawings and above particularly described within theprinciple and scope of my invention.

I claim:

1. A stone saw comprising a blade having a recess in its edge. anabrasive tooth projecting fl'ml'l tlle edge of the blade and providedwith a tootli-strengthening rein- -fcn'cing projection entering the saidrecess and serving to prevent the tooth breaking when it becomes worn,and tooth-holding members on the blade engaging the ends of the toothand projecting beyond the edge of the blade for wearing down with thetooth.

2. A stone saw comprising a blade having a recess in its edge. anabrasive tooth covering the recess at the edge of the blade andprojecting from the edge of the blade,

'a tooth-reinforcing anchor projecting in-- ward from such tooth andanchored in the said recess to strengthen the tooth against breakingwhen worn. and tooth-holding members on the blade engaging the ends ofthe tooth and projecting beyond the edge of the blade for wearing downwith the tooth.

3. A stone saw comprising a blade having a recess in its edge. anabrasive tooth covering the recess at the edge of the blade andprojecting beyond the edge of the blade. :1 tooth-strengtheningreinforcing anchor adhesively attached to the abrasive tooth andanchored in the recess in the blade to prevent breaking of the toothwhen worn. and tooth-holding members on the blade engaging the ends ofthe tooth and projecting beyond the edge of the blade for wearing downwith the tooth. i 4. A stone saw comprising a blade. abrasive teethprojecting from the edge of the blade. and a tooth-holding memberanchored to the blade and having two spaced tooth-engaging prongsengaging two adacent abrasive teeth to hold the teeth on the blade andadapted to wear dtiwuwith the abrasive teeth.

5. A stone saw comprising a blade. abrasive teeth tapered in lengthfromtheir base portions toward their cutting edges projecting from the edgeof the blade. and a toothengaging wedge anchored to the blade and havingspaced flaring prongs engaging the tapered portions of two adjacentabrasive teeth to hold the teeth on the blade.

(3. A stone saw comprising a blade having a series of sockets in theedge thereof. abrasive teeth projecting from the edge of ,the bladebetween the sockets. and a tooth-holding member for each socket havingan anchor portion set in the socket and having two spaced tooth-engagingprongs one of which engages and holds the tooth at one side of thesocket and the other of which engages and holds the teeth at the otherside of the socket, the middle portions of such tooth-holding memberbeing thinner than the thickness of the blade.

7. A stone saw comprising a blade having a series of wedge-receivingsockets in the edge. thereof. abrasive teeth tapered in length fromtheir base portions toward their cutting edges projecting from the edgeof the blade between the sockets. and a toothhoiding wedge for eachsocket anchored in the socket and having spaced flaring prongs engagingthe tapered portions of the two adjacentabrasive teeth to hold the teethon the blade.

8. A stone saw comprising a blade having a series of wedge-receivingsockets in the edge thereof, abrasive teeth tapered in length from theirbase portions toward their cutting edges projecting from the edge of theblade between the sockets. a toothholding wedge for each socket having ashank portion received into the socket and having tooth-engagingportions engaging the tapered portions of the two adjacent abrating insuch openings and adapted to draw the tootlrholding wedges inward intofirm wedging contact with the tapered portions of the abrasive teeth.

9. A stone saw comprising a blade having a series of sockets in the edgethereof. abrasive teeth projecting from the edge of the blade betweenthe sockets. and a toothholding member for each socket engaging twoadjacent abrasive teeth to hold the teeth on the blade and having ananchor portion set in the socket and extending inward beyond the teeth,the middle longitudinal portions of such tooth-holding member beingthinner than the thickness of the blade.

10. A stone saw comprising a blade having a series of sockets in theedge thereof, abrasive teeth projecting fi'om'the edge of the bladebetween the sockets. and a toothholding member for each socket engagingtwo adjacent abrasive teeth to hold the teeth on the blade and having ananchor portion set in the socket and extending inward beyond the teeth,such tooth-holding member being hollowed out longitudinally so that itsmiddle portions are thinner than .its edge portions and also thinnerthan the thickness of the blade.

11. A stone saw comprising a blade having a series of sockets in theedge thereof, abrasive teeth thicker than the blade projecting from theedge of the blade between the sockets, and a tooth-holding member foreach socket thinner throughout than the teeth having a shank anchored inthe socket and having a toothholding portion bifurcated to form spacedtooth-holding prongs engaging adjacent abrasive teeth to hold the teethon the blade.

12. A stone saw comprising a blade having a series of sockets in theedge thereof, abrasive teeth projecting from the edge of the bladebetween the sockets, and a toothholding member for each socket having aspaced flaring prongs respectively engaging such adjacentteeth fromtheir bases outward and adapted to wear down with the teeth.

14:. A holding member for abrasive teeth of stone saws, such memberhaving a. shank for anchoring the member in place on a saw blade, andhaving spaced tooth-holding prongs projecting from the shank forengaging adjacent teeth.

15. A holding member for abrasive teeth of stone saws, such memberhaving a shank for anchoring the member in place on asaw blade, andhaving spaced tooth-holding prongs projecting from the shank and flaredoutwardly for engaging adjacent teeth, the middle longitudinal portionsof such t00thholding member being thinner than its edge portions.

In testimony whereof I have affixed my signature in presence of twowitnesses.

. \VILLARD F. MEYERS. lVitnesses HENRY D. lVILLIAMs, BERNARD COWEN.

